Mathematical proceedings of the Royal Irish academy. Vol.60, №2 : A property of bounded regular functions. В книге говорится " The properties of a bounded regular function can be defined by a series of terms: a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z. For a function of a number the bounds of its algebraic series are defined to be the following:
1. A = b + c;
2. A = c + d;
3. A = d + e;
4. A = e + f;
5. A = f + g;
6. A = g + h;
7. A = h + i;
8. A = j + k;
9. A = l + m;
10. A = n + o;
11. A = p + q;
12. A = r + s;
13. A = t + u;
14. A = v + w;
15. A = x + y;
16. A = z + i.